Spectroscopy and Spectral Analysis, Volume. 29, Issue 8, 2152(2009)
Compositions and Structure Characterizations of Coal Tar Refined Soft Pitch
High temperature coal tar was used as raw materials, and was distilled to 280 ℃ for getting coal tar soft pitch. Then refined soft pitch was obtained by solvent extracting and subsequent settlement method. Its soft point was 32 ℃; the group compositions consisted of 53.67% heptane soluble, 39.47% heptane insoluble but toluene soluble, 6.86% toluene insoluble and 0.06% quinoline insoluble. The relative average molecular weight was about 292. Its average molecular formula was C22.22H16.32N0.12S0.06O0.33; the total content of heteroatom was less than 1. IR analytic results showed that its heteroatom O existed in the R—O—R and Ar—O—R structure; its heteroatom N existed in the R—NH—R and N, with the latter being primary. Its average structure was obtained by improved Brown-Lander model: five-membered condensed rings. UV analysis indicated that the majority was linear arrangement, and the minority was surface arrangement; namely, the chemical structure of the samples was mainly the cata-condensed structure, while the minority was peri-condensation.
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GAO Li-juan, ZHAO Xue-fei, LAI Shi-quan, CHENG Jun-xia, LU Yi-qiang. Compositions and Structure Characterizations of Coal Tar Refined Soft Pitch[J]. Spectroscopy and Spectral Analysis, 2009, 29(8): 2152